Swivel-shell attachment plug



Patented Nov. 24, 1925.

UNITED PATENT OFFICE.

STANLEY MGCLATCHIE, 0F CATEBRIIJGE, MASSACHUSETTS, ASSIGNOR TO BENJAMIN ELECTRIC MANUFACTURING ClvPif-NY, OF CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.

SIVIVEL-SHELL ATTAGHIVENT PLUG'.

Application filed November 20,A 1920.

To all whom t muy concern.'

Be it known that I, STANLnY McCLA'roHin, a citizen of the United States, residing at Cambridge, in the county ott' Middlesex and State of Massachusetts, have invented new and useful Improvements in Swivel-Shell Attachment Plugs, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this speci- ;tcation.

lMy invention relates to electrical connector devices and more particularly to swivel shell attachment plugs.

One ot the objects ot my invention is to provide an improved swivel shell attachment plug which will be durable and etcient in operation, simple in construction, easy to wire and cheap to manufacture.

Further objects will appear 'from the detailed description to follow and from the appended claims.

In the drawings in which an embodiment of my invention is shown- Fig. 1 is a side elevation of a swivel shell attachment plug;

Fig. 2 is an axial section of the plug shown in Fig. 1;

Fig. 3 is a top plan view of the outer base part and the parts mounted thereon;

Fig. 4 is a side elevation of Fig. 3; and

Fig. 5 is an axial section showing` another Aform of my invention.

Referring irst to Figs. 1 to 4 inclusive, the construction shown therein comprises a wiring terminal 10 for the center contact 11, a wiring terminal 12 for the threaded swivel shell 13, an insulating base, comprising an inner part 14 and an outer part 15, for supporting the wiring terminal and contact and suitably insulating them with respect to each other, and a tubular insulating handle and housing member 1G secured to the threaded shell contact 13 tor screwing it into the socket, and for surrounding the wiring terminals l() and 12 and housing them.

The wiring terminals 10 and 12 are both mounted on Jthe outer base part 15 by means ot an eyelet 1'?, which extends through registering openings in the wiring terminals and base and has its ends riveted over to hold the wiring terminals in place.

The center contact 11 is formed as the head of a screw, the shank 18 ot' which ez;-

Seral No. 425,329.

tends through a central opening in the inner base 14 and is threaded into the eyelet `17, the screw thus serving to hold the base parts 14 and 15 together and also to connect the wiring terminal 10 with the center contact 11.

The wiring terminal 12 has a sliding contact portion 19, extending outwardly into engagement with the inwardly extending flange or shoulder 2() ot the swivel contact 13, whereby the swivel shell Contact 13 is electrically connected with the .wiring terminal 12.

The outer base part 15 is suitably recessed at 21 and 22 to provide room for the wiring terminals 10 and 12 respectively. A central axial opening 23 is provided in the outer base part to afford a passage for the conductors leading to the wiring terminals 10 and 12. The handle and housing member 16 may be secured to the threaded shell contact 13 by embedding the outer edge of the threaded shell Vcontact in the molded insulation.

In wiring` the plug, a screw driver is applied to the center contact 11 to disconnect the inner and outer base parts 14 and 15, the outer base part 15 carrying the wiring terminals 10 and 12 is slipped out of the hous` ing and handle member 16, the sliding contact member 19 being shifted laterally to etfect this disconnection, and the wires are connected to the wiring terminals 10 and 12. The base part 15 is then slipped back inside the handle and housing member 16, and the center Contact screw 11 is screwed into the eyelet 17 to connect the parts.

It will be noted that in wiring the terminals 10 and 12 that their heads are exposed and easily accessible when the base 15 is removed from the handle and housing member 16.

In screwing the plug into the socket the threaded shell contact 13 is swiveled with respect to the two-part base which carries the center contact and wiring terminals 10 and 12, so that the cords secured to the wiring terminals 10 and 12 are not twisted 'when the threaded shell contact is screwed in.

rIhe construction shown in Fig. 5 is substantially the same as that shown in Figs. 1 to 4 inclusive, except as to the handle 23a for screwing in the threaded shell contact 24, and the insulating housing member 25,

which surrounds the wiring terminals l and l2. The wiring terminals and l2, the center contact Il', the inner and outer base parts 14 and 15 may be the same as in the form previously described. In this form of my invention the housing member 25 which surrounds the wiring terminals l0 and l2 is made separate from the handle member 23 which is used to screw in the threaded shell contact 24, this housing member 25 being held in place by means of a shoulder 26 on the outer base part l5. This housing member 25 may be a libre sleeve. The handle member 23a may be a fibre stamping secured to the threaded shell contact by Hanging over the outer edge of the threaded shell contact as indicated at 27. The wiring and use of the plug shown in Fig. 5 is substantially the same as in the form previously described.

In this application the expression enten ing end has been used referring to the end ofthe threaded shell contact which first enters the socket, and the expression outer end has been used referring to the end which enters the socket last. v

While I have shown but two embodiments of' my invention, it may be embodied in other forms covered and defined by the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of thel United States is:

l. A swivel shell attachment plug comprising a threaded shell contact having an inwardly extending flange at its outer end, a center contact member, an insulating` base in said shell contact tor `positioning and insulating` said contacts with respect to each other, and a subeassembly substantially outside said shell contact comprising` an insulating member,` a pair of wiring terminals having base portions at opposite ends of said insulating member, an eyelet extending` axially through said insulating member and base portions, for securing said wiring terminals on said insulatingl member, and a metal tension member extending between said eyelet and center contact member for holding said sub-assembly in assembled position and electricallyv connecting the center contact with one of said wiring terminals, the other wiring terminal being provided with a sliding contact member :tor engagement with said inwardly extending flange.

2. A. swivel shell attachment plug coinprising a threaced shell contact having an inwardly extending flange at its outer end, a center contact member, an insulating base in said shell contact for positioning and insulating said contacts with respect to each other, and a sub-assembly substantially outside said shell. contact comprising an insulating member, a pair of wiring terminals having base portions at opposite ends of said insulating` member` an eyelet extending axially through said insulating member and base portions, :tor securing said wiring terminals on said insulating member, and a metal tension member extending between said eyelet and center contact member for holding said sub-assembly in assembled position and electrically connecting` the center contact with one of said terminals, the other wiring terminal being provided with a sliding contact member for engagement with said inwardly extending flange, said subassembly being laterally movable with respect to said shell contact in assembling to hook said sliding contact member over said flange.

3. A swivel shell attachment plug comprising a threaded shall contact having an inwardly extending flange at its outer end, a center contact member, an insulating base in said shell contact for positioning andinsulating said contacts with respect to each other, and a sub-assembly substantially outside said shell contact comprising an insulating member, a pair ot' wiring terminals having base portions at opposite ends el said insulating member, an eyelet extending axially through said insulating member and base portions, for securing said wiring` terminals on said insulating member, and a metal tension member extending between said eyelet and center contact member for holding said sub-assembly in assembled position and electrically connecting the center contact With one of said wiring terminals, the other wiring terminal being provided with a sliding contact member for engagement with said inwardly extending flange, said sub-assembly being laterally movable with respect to said shell contact in assembling to hook said sliding contact member over said flange, each of said wiring terminals comprising a bindingplate portion extending longitudinally of the plug and a binding screw extending transversely of the plug.

4. A swivel shell attachment plug comprising a threaded shell contact having an inwardly extending flange at itsl outer end, a center contact member, an insulating base in said shell contact for positioning and insulating said contacts with respect toeacli other, and a sub-assembly substantially outside said shell contact comprising an insulating member, a pair et wiring terminals having base portions at opposite ends of said insulating member, an eyelet extending axially through said insulating member and base portions, t'or securing said wiring terminals on said insulating member, and a metal tension member extending between said eyelet and center contact member for holding said sub-assembly in assembled position and electrically connectingthe center contact with one of said wiring terminals, the other wiring terminal being provided with a sliding contact member for engagement with said inwardly extending flange, said sub-assembly being` laterally movable with respect to said shell Contact in assemblingto hook said sliding Contact member over said flange, each of 5 said Wiring terminals comprising a binding plate portion extending longitudinally of the plug and a binding screw extending transversely of the plug, and an insulating housing and handle member secured to said shell Contact and housing said Wiring terminals.

In Witness whereof, I have hereunto subscribed my name.

STANLEYMCCLATCHIE. 

